package com.heima.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter , Ordered {


    /**
     * 全局过滤器的过滤方法  校验token是否合法
     * @param exchange  交换机：网关web环境的交换机
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取请求响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.放行登录请求
        String path = request.getURI().getPath();
        if (StringUtils.contains(path,"/login/login_auth")){
            return chain.filter(exchange);
        }

        //3.获取请求头中的token
        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //4.校验token
        Claims claims = AppJwtUtil.getClaimsBody(token);
        //5.校验通过放行，校验失败返回401
        int result = AppJwtUtil.verifyToken(claims);
        //校验通过放行
        if (result==0||result==-1){

            //5.1获取token中的用户id
            String userId = claims.get("id").toString();
            //5.2将userid携带到微服务（放入到请求中）
            ServerHttpRequest httpRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", userId)).build();
            ServerWebExchange webExchange = exchange.mutate().request(httpRequest).build();

            return chain.filter(webExchange);
        }
        //校验失败，返回401
        response.setStatusCode(HttpStatus.UNAUTHORIZED);
        return response.setComplete();

    }


    @Override
    public int getOrder() {
        return 0;
    }
}
